Method of applying active material to secondary-battery plates.



G. W. HAYDEN.

METHOD or APPLYING ACTIVE MATERIAL T0 SECONDARY BATTERY PLATES.

AHPPLICATION FILED IULY L. 1914.

Patented Sept. 12, 1916.

UNITED STATES GEORGE WALWOBTH HAYDEN, F BUFFALO, NEW YORK, ASSIGNOB TOCOMPANY, OF NEW YORK, N. Y.

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METHOD OF APPLYHdG ACTIVE MATERIAL TO SEGONDAIBY-QBATTEBY PLATES.

To all whom it may concern:

Be it known that I, GEORGE W. HAYDEN,

" a citizen of the United States, residing at vided with cavitiesBuffalo, in the county of Erie and-State of New York, have invented anew and useful Improvement in Methods of Applying Active Material toSecondary-Battery Plates, of which the following is a' specification.

This invention relates to a method of apthe cost of the electrodes.Attempts have been made to apply the material to the plates moreexpeditiously and economically by rolling and in other ways, but thesemethods have, in most instances, not been commercially successful.

The object of this invention is the paste to battery plams or thoroughlypractical method in pp y grids by a which is expeditious and economicaland which further more enables the density or hardn$ oi the paste on theplate to be readily regulated as may be required. According to thismethod the battery plate with a batch of the active paste thereon isplaced on a jarring onjolting machine and jarred, thereby causing thepaste to spread and pack into the'con spaces of the plate. After thusjarring the plate the upper surface of the paste is leveled ofi, or thesuperfluous paste removed from the upper surface of the grid or plate,for instance by scraping .it oil with a suitable blade or'tool. Ifdesired, the plate can be scraped so as to leave the paste in theconfining spaces of the plate substantially flush with the upper surfaceof the rate g bars or portions of the plate. The density or hardness ofthe parts in the plate or grid is dependent upon the extent to which theplate or grid is jarred, and can be readily regulated as desired byjarring the plate a greater or less number of times.

Difierent active materials vary more or less in consistency, forinstance the paste sometimes used in positive electrodes is thuspreparing the retaining spaces Specification of Letters Patent. Pa,tentgql Sept, 12 1916 Application filed 3111? i, 1914. Serial in. 848,371.

stifier than that used in fiegative electrodes. In applying suchpastesit..-is usually advantageous to further compress the paste byrolling action after jarring the paste into the grids or plates as aboveexplained. When electrodes the paste is omen. v

not scrafped 0d of the plate or grid flush with the sur ace thereof butis scraped so that a layer of pasteis left projecting somewhat above thesurface of the plate or grid. This relatively thin layer of paste iscompressed into the co g spaces of the plate or grid when the latter ispassed between the compressing rolls.

In the accompanying drawings: Figured is an elevation-"of a batteryelectrode filled with paste according to this method, a portion of thepaste Ming removed to disclose the plate or'grid. Fig. 2 is a viewilluflrating the mamer of jarring the paste into the grid. Fig. 3 is aview showing howthe superfiuous paste is scraped 0d of the plate orgrid. Fig. 4 is a view illustrating how the pade is scraped 0d of aplate or grid which s to be afterward rolled. Fig. 5 is a viewillustrating the rolling step of the operation. As indicated in Fig. 2,the

battery plate or grid A is laid on the vertically recipro eating platenb of a jarring or jolting machine B, which may be of any hown orsuitable type, and a batch hi the active material or paste C is placedon the plate or grid. When the jarring machine is set in operation thepaste is caused to pack into the confining spaces of the plate or gridby the reciprocations of the lat/en Z), the jarring action beingcontroll as required to give the desired compactness or hardness of thepaste in the plate or "d. The pads is then leveled or scraped o of theplate or grid by means off-a suitable blade or tool D, as indicated inri a.

l ig. dshows a scraper E suitable for use when the electrode is torolled after jarring in the paste. This scraper has depending endportions 6 which hold the scraping edge up 0d oi, the suriaceof theplate or grid so as to leave a projecting layer f of the paste on theplate or grid. Any other suitable means could be used in place of thescraper E. This projecting layer of plate or 1 e plate G G, as is pref-3m erably yield-ingly mounted, and springs g or other means can beemployed forregw lating the pressure of the roll as required. By thusrolling the electrode after first jarring in the paste as explained, andleavtical results by attempting to roll the paste into the grid: withoutthe preliminary jarring operation.

I claim as my invention: The herein described method of applying jarringthe plate to fill the cavities thereof with said material, leveling offthe material to leave a substantially uniform layer of materialprojecting above the plate, and then subjecting the material to arolling action to compress it into the cavities of the plate. v

Witness my hand, this 26th day of June,

- GEORGE WALWORTH HAYDEN.

Witnesses:

R. D. WILLIAMS, G. L. TALLEY,

